dkg: better nonce

[pinebit]

Better nonce generation and variation for dkg.

category: refactor
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.64%. Comparing base (e1f4b2f) to head (43db81e).

Files with missing lines	Patch %	Lines
dkg/pedersen/reshare.go	73.91%	3 Missing and 3 partials ⚠️
dkg/pedersen/dkg.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4282   +/-   ##
=======================================
  Coverage   56.64%   56.64%           
=======================================
  Files         237      237           
  Lines       31332    31341    +9     
=======================================
+ Hits        17748    17754    +6     
- Misses      11311    11319    +8     
+ Partials     2273     2268    -5     

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